Patents by Inventor Wulf Schwerdtel
Wulf Schwerdtel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 4934519Abstract: An improved process for working-up crude liquid vinyl acetate which contains vinyl acetate, acetic acid, water, and ethyl acetate, possibly together with small amounts of other impurities, by distillation is disclosed, wherein a mixture essentially containing vinyl acetate and water is obtained as the top product and essentially acetic acid is obtained as the bottom product, and a sidestream, in which ethyl acetate is concentrated is removed. According to the process the top product is condensed and, after phase separation, a portion of the vinyl acetate phase is recycled as reflux into the distillation. The improved process involves the introduction of water above the point of introduction of the crude vinyl acetate. Preferably, the water is introduced in an amount which is not greater than the amount required to achieve a maximum water content in the vapors leaving the distillation at the top.Type: GrantFiled: June 28, 1985Date of Patent: June 19, 1990Assignee: Bayer AktiengesellschaftInventors: Gunter Wolf, Hubert Lauer, Wulf Schwerdtel
-
Patent number: 4548913Abstract: A new catalyst which can be prepared from certain aluminosilicates and certain clay minerals, a process for its preparation and a process for the skeletal isomerization of n-alkenes to iso-alkenes which is carried out in the presence of this catalyst.Type: GrantFiled: December 12, 1983Date of Patent: October 22, 1985Assignee: Bayer AktiengesellschaftInventors: Wulf Schwerdtel, Hubert Lauer, Josef Heinrich
-
Patent number: 4313879Abstract: The invention relates to a process for the production of .epsilon.-caprolactone having a purity of 99.9% and increased color and storage stability which comprises feeding .epsilon.-caprolactone, which has been made by reacting cyclohexanone with a solution of a percarboxylic acid, into a first distillation unit, operating at 0.1 to 500 mbars and drawing off as the top product a mixture consisting of .epsilon.-caprolactone and lower-boiling impurities, feeding the bottom product of said first distillation unit into a second distillation unit, operating at 0.1 to 500 mbars and then drawing off the pure .epsilon.-caprolactone as the top product. The .epsilon.-caprolactone is useful as an intermediate for the production of known useful compounds such as polyesterols which are subsequently converted to polyurethanes.Type: GrantFiled: August 20, 1980Date of Patent: February 2, 1982Assignees: Degusa AG, Bayer AktiengesellschaftInventors: Herbert Klenk, Rolf Wirthwein, Gerd Siekmann, Wulf Schwerdtel
-
Patent number: 4293717Abstract: Aldehydes and diols are prepared by reacting an olefine with hydrogen peroxide in the presence of a Group Va or VIa metal compound, such as molybdenum-(III)-acetylacetonate.Type: GrantFiled: February 5, 1979Date of Patent: October 6, 1981Assignee: Bayer AktiengesellschaftInventors: Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4244877Abstract: A process for the preparation of hexahydrophthalic acid anhydride which comprises hydrogenation .DELTA..sup.4 -tetrahydrophthalic acid anhydride in the liquid phase at a temperature of from 70.degree. to 150.degree. C. and at a pressure of from 30 to 200 bar in the presence of a catalyst selected from palladium, ruthenium, nickel or mixtures thereof arranged in a fixed bed, wherein the catalyst is applied to a carrier of alumina of which at least 20% by weight has been converted into lithium aluminium spinel and the liquid phase is a mixture of .DELTA..sup.4 -tetrahydrophthalic acid anhydride and hexahydrophthalic anhydride in a proportion by weight of from 1:1 to 1:100.Type: GrantFiled: May 23, 1979Date of Patent: January 13, 1981Assignee: Bayer AktiengesellschaftInventors: Kurt Halcour, Helmut Waldmann, Wulf Schwerdtel
-
Patent number: 4220597Abstract: A process has been found for the preparation of anthraquinone by catalytic oxidation of naphthalene in the gas phase to provide a reaction product, obtained by quenching, cooling or quenching and cooling, containing naphthaquinone and phthalic anhydride, treating said reaction product directly with butadiene to provide tetrahydroanthraquinone, oxidation by means of molecular oxygen to the tetrahydroanthraquinone contained in this reaction product, to give anthraquinone, and separation of naphthalene, phthalic anhydride, anthraquinone and by-products by distillation, the gases produced in the quenching and/or cooling of the gases from the naphthalene oxidation and the gases from the oxidation of the tetrahydroanthraquinone to give anthraquinone being completely or partially recycled to the oxidation of naphthalene, in which a compound with an alkaline reaction is introduced between the reactor in which naphthalene is oxidized and the reactor in which the reaction with butadiene takes place, and/or into the gasType: GrantFiled: January 25, 1979Date of Patent: September 2, 1980Assignee: Bayer AktiengesellschaftInventors: Kurt Halcourt, Paul Losacker, Manfred Martin, Norbert Schenk, Wulf Schwerdtel
-
Patent number: 4214105Abstract: A process for the production of pyrocatechol and hydroquinone by the hydroxylation of phenol in the nucleus with hydrogen peroxide, wherein phenol is reacted at the start of the reaction with substantially anhydrous hydrogen peroxide and wherein the reaction is carried out in the presence of a strong acid.Type: GrantFiled: September 15, 1978Date of Patent: July 22, 1980Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4182918Abstract: A process has been invented for the preparation of dihydric substituted phenols which comprises reacting a solution, which is essentially anhydrous and free from hydrogen peroxide, of a percarboxylic acid in an inert organic solvent with a monohydric substituted phenol, which is derived from benzene, naphthalene or anthracene and still contains at least one free hydrogen atom in the aromatic nucleus, at temperatures from about -20.degree. C. to about 120.degree. C.The dihydric substituted phenols obtained according to the invention are known, important industrial intermediate products used in the fields of photography, dyestuffs and plastics, as well as in the scent and flavoring areas.Type: GrantFiled: December 5, 1977Date of Patent: January 8, 1980Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4182917Abstract: A process has been invented for the preparation of pyrocatechol and hydroquinone which comprises reacting a solution which is substantially anhydrous and free from hydrogen peroxide, of a percarboxylic acid in an inert, organic solvent, with phenol at temperatures from -10.degree. C. to 80.degree. C.The compounds obtained according to the invention are known, important industrial chemicals which are used in large amounts in the field of photography and of dyestuffs and plastics and in the field of scents and flavorings.Type: GrantFiled: December 5, 1977Date of Patent: January 8, 1980Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4174460Abstract: A process for the hydroxylation of phenols and phenol ethers in the nucleus with hydrogen peroxide wherein a phenol or a phenol ether is reacted at the start of the reaction with substantially anhydrous hydrogen peroxide and wherein the reaction is carried out in the presence of a strong acid.Type: GrantFiled: March 31, 1977Date of Patent: November 13, 1979Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldman, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4137242Abstract: Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5, 18) and following drying of the benzene solution (21), the perpropionic acid in the solution is reacted with propylene (24) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (30, 32, 37, 39), and the latter two are recycled. In the benzene extraction (5, 18), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst.Type: GrantFiled: April 28, 1976Date of Patent: January 30, 1979Assignees: Bayer Aktiengesellschaft, Deutsche Gold- und Silber-Scheideanstalt Vormals RoesslerInventors: Gunter Prescher, Gerd Schreyer, Otto Weiberg, Rolf Wirthwein, Helmut Waldmann, Hermann Seifert, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4115462Abstract: Process for the preparation of cycloaliphatic hydrocarbons by gas phase hydrogenation of aromatic hydrocarbons in the presence of palladium catalyst, characterized in that palladium catalyst is used which contains the palladium applied to a support which comprises aluminium oxide of which at least 20% by weight, relative to the weight of the support, has been converted to lithium-aluminium spinel. The gas phase hydrogenation can be carried out at atmospheric pressure.Type: GrantFiled: April 19, 1977Date of Patent: September 19, 1978Assignee: Bayer AktiengesellschaftInventors: Hermann Thelen, Kurt Halcour, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4113747Abstract: Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5 , 12), and following drying of the benzene solution (16), the perpropionic acid in the solution is reacted with propylene (18) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (25, 27, 31, 33), and the latter two are recycled. In the benzene extraction (5, 12), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst. Water is removed from the aqueous raffinate (8) and the concentrate is recycled to the propionic acid reactor. Make-up hydrogen peroxide can be added to the aqueous raffinate before the removal of water.Type: GrantFiled: April 28, 1976Date of Patent: September 12, 1978Assignees: Bayer Aktiengesellschaft, Deutsche Gold- und Silber-Scheideanstalt Vormals RoesslerInventors: Gunter Prescher, Gerd Schreyer, Otto Weiberg, Rolf Wirthwein, Helmut Waldmann, Hermann Seifert, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4087455Abstract: Process for the continuous preparation of organic solutions of percarboxylic acids by reaction of aqueous hydrogen peroxide with the corresponding carboxylic acid in the presence of an acid, water-soluble catalyst, extraction of the resulting reaction mixture with an organic solvent and recycle of the raffinate, containing hydrogen peroxide, after reconcentration by the removal of water by distillation into the reaction. The raffinate is fed, together with the whole of that amount of hydrogen peroxide which essentially to the consumption of hydrogen peroxide in the reaction or with a part thereof, into the distillation for the removal of water. The amount of water which essentially corresponds to the sum of the water of reaction formed during the reaction and the water introduced into the process with the feed products is distilled off under reduced pressure. The sump product, thus obtainable, from the distillation is recycled into the reaction.Type: GrantFiled: April 28, 1976Date of Patent: May 2, 1978Assignees: Bayer Aktiengesellschaft, Deutsche Gold-und Silber-Scheideanstalt Vormal RoesslerInventors: Gunter Prescher, Gerd Schreyer, Helmut Waldmann, Wulf Schwerdtel
-
Patent number: 4059619Abstract: Process for continuous production of substantially anhydrous solutions of perpropionic acid in benzene. Aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid and water (1). The perpropionic acid is extracted with benzene (5), to provide a benzene phase containing the perpropionic acid (11) and an aqueous raffinate (7). The benzene phase is subjected to an extraction with water (12) involving at least 3 stages, to remove hydrogen peroxide, and the resulting benzene extract (15) is subjected to azeotropic distillation (26) to provide the anhydrous solution (17). The aqueous raffinate, which contains hydrogen peroxide, is distilled to remove water (8) and the resulting concentrate is recycled (2) for use in the reaction (1).Type: GrantFiled: April 28, 1976Date of Patent: November 22, 1977Assignees: Deutsche Gold-und Silber-Scheideanstalt Vormals Roessler, Bayer AktiengesellschaftInventors: Gunter Prescher, Gerd Schreyer, Otto Weiberg, Rolf Wirthwein, Helmut Waldmann, Hermann Seifert, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4053523Abstract: A process for the production of pyrocatechol and hydroquinone by the hydroxylation of phenol in the nucleus with hydrogen peroxide, wherein phenol is reacted at the start of the reaction with substantially anhydrous hydrogen peroxide and wherein the reaction is carried out in the presence of a strong acid.Type: GrantFiled: February 28, 1975Date of Patent: October 11, 1977Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: 4048242Abstract: Producton of cyclopentene by splitting of dicyclopentadiene to produce cyclopentadiene and hydrogenating the cyclopentadiene to produce the cyclopentene in crude form, and distilling the crude cyclopentene to separate low boilers and high boilers therefrom and provide the cyclopentene product. The high boilers are recycled to the dicyclopentadiene splitting stage and serve to reduce resin formation in that stage. The process is particularly effective where the dicyclopentadiene has a low content of the so-called "codimers" which, if present in sufficient amount, would reduce resin formation.Type: GrantFiled: May 8, 1975Date of Patent: September 13, 1977Assignee: Bayer AktiengesellschaftInventors: Hubert Lauer, Norbert Schenk, Wulf Schwerdtel
-
Patent number: 4045496Abstract: A process for the hydroxylation of phenols and phenol ethers in the nucleus with hydrogen peroxide wherein a phenol or a phenol ether is reacted at the start of the reaction with substantially anhydrous hydrogen peroxide and wherein the reaction is carried out in the presence of a strong acid.Type: GrantFiled: February 28, 1975Date of Patent: August 30, 1977Assignee: Bayer AktiengesellschaftInventors: Hermann Seifert, Helmut Waldmann, Wulf Schwerdtel, Wolfgang Swodenk
-
Patent number: RE30945Abstract: Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5, 12), and following drying of the benzene solution (16), the perpropionic acid in the solution is reacted with propylene (18) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (25, 27, 31, 33), and the latter two are recycled. In the benzene extraction (5, 12), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst. Water is removed from the aqueous raffinate (8) and the concentrate is recycled to the propionic acid reactor. Make-up hydrogen peroxide can be added to the aqueous raffinate before the removal of water.Type: GrantFiled: February 14, 1980Date of Patent: May 25, 1982Assignees: Bayer AG, Deutsche Gold-und Silver Scheideanstalt Vormals RoesslerInventors: Guter Prescher, Gerd Schreyer, Otto Weiberg, Rolf Wirthwein, Helmut Waldmann, Hermann Seifert, Wulf Schwerdtel, Wolf Swodenk
-
Patent number: RE31381Abstract: Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5, 18) and following drying of the benzene solution (21), the perpropionic acid in the solution is reacted with propylene (24) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (30, 32, 37, 39), and the latter two are recycled. In the benzene extraction (5, 18), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst.Type: GrantFiled: February 14, 1980Date of Patent: September 13, 1983Assignees: Bayer Aktiengesellschaft, Deutsche Gold-und Silber-ScheideanstaltInventors: Gunter Prescher, Gerd Schreyer, Otto Weiberg, Rolf Wirthwein, Helmut Waldmann, Hermann Seifert, Wulf Schwerdtel, Wolf Swodenk